The bryozoan Schizoporella japonica Ortmann (1890) was first recorded in European waters in 2010 and has since been reported from further locations in Great Britain (GB) and Norway. This paper provides a new earliest European record for the species from 2009, a first record from Ireland and presence and absence records from a total of 231 marinas and harbours across GB, Ireland, the Isle of Man, France and Portugal. This species is typically associated with human activity, including commercial and recreational vessels, aquaculture equipment, and both wave and tidal energy devices. It has also been observed in the natural environment, fouling rocks and boulders. The species has an extensive but widely discontinuous distribution in GB and Ireland. Although found frequently in marinas and harbours in Scotland, it inhabits only a few sites in England, Wales and Ireland, interspersed with wide gaps that are well documented as genuine absences. This appears to be a rare example of a southward-spreading invasion in GB and Ireland. The species has been reported from the Isle of Man and Norway but has not been found in France or Portugal. In the future we expect S. japonica to spread into suitable sections of the English, Welsh and Irish coasts, and further within Europe. The species' capability for long-distance saltatory spread and potential for negative impact on native ecosystems and economic activity suggests that S. japonica should now be considered invasive in GB and Ireland. As such, it is recommended that biosecurity procedures alongside effective surveillance and monitoring should be prioritised for regions outside the species' current distribution.

中文翻译：

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侵袭性苔藓日本血吸虫的分布在英国和爱尔兰及其在欧洲的分布。

苔藓日本血吸虫（Schizoporella japonica Ortmann）（1890年）最早于2010年在欧洲水域被发现，此后据报道在英国（GB）和挪威的其他地方。本文提供了该物种自2009年以来的欧洲最早记录，是爱尔兰的第一个记录，以及GB，爱尔兰，马恩岛，法国和葡萄牙的总共231个码头和港口的有无记录。该物种通常与人类活动有关，包括商业和娱乐船只，水产养殖设备以及波浪能和潮汐能设备。在自然环境中，岩石和巨石也受到污染。该物种在GB和爱尔兰有广泛但不连续的分布。尽管它经常在苏格兰的码头和港口中发现，但仅栖息于英格兰的少数地方，威尔士和爱尔兰散布着巨大的缺口，有据可证明是真正的缺席。这似乎是GB和爱尔兰向南蔓延入侵的罕见例子。该物种已从马恩岛和挪威报道，但尚未在法国或葡萄牙发现。将来，我们希望日本粳稻会传播到英国，威尔士和爱尔兰沿海的适当地区，并进一步传播到欧洲。该物种具有长距离盐分扩散的能力以及对本地生态系统和经济活动产生负面影响的潜力，这表明日本沙棘现在应被视为对GB和爱尔兰的入侵。因此，建议对物种当前分布范围以外的区域优先考虑生物安全程序以及有效的监视和监测。散布着巨大的空白，这些空白被证明是真正的缺席。这似乎是GB和爱尔兰向南蔓延入侵的罕见例子。该物种已从马恩岛和挪威报道，但尚未在法国或葡萄牙发现。将来，我们希望日本粳稻会传播到英国，威尔士和爱尔兰沿海的适当地区，并进一步传播到欧洲。该物种具有长距离盐分扩散的能力以及对本地生态系统和经济活动产生负面影响的潜力，这表明日本沙棘现在应被视为对GB和爱尔兰的入侵。因此，建议对物种当前分布范围以外的区域优先考虑生物安全程序以及有效的监视和监测。散布着巨大的空白，这些空白被证明是真正的缺席。这似乎是GB和爱尔兰向南蔓延入侵的罕见例子。该物种已从马恩岛和挪威报道，但尚未在法国或葡萄牙发现。将来，我们希望日本粳稻会传播到英国，威尔士和爱尔兰沿海的合适地区，并进一步传播到欧洲。该物种具有长距离盐分扩散的能力以及对本地生态系统和经济活动产生负面影响的潜力，这表明日本沙棘现在应被视为对GB和爱尔兰的入侵。因此，建议对物种当前分布范围以外的区域优先考虑生物安全程序以及有效的监视和监测。